Image Processing Reference
In-Depth Information
F
MPEG-2 Profiles and Levels
F.1
MPEG-2 Complexity
MPEG-2 is simplified by defining a set of profiles and levels that help to constrain the tools
that encode and decode MPEG-2 content. This helps decoder manufacturers build products
that handle a defined level of functionality. The encoder manufacturers then have a clear
target and some bounded limits within which their bit-stream creation can be engineered.
F.2
MPEG-2 Profiles
Table F-1 lists the profiles that are defined for MPEG-2:
F-1 MPEG-2 Profiles
Profile
Description
Simple (SP)
A very simple profile that does not support B-frames, thereby
allowing decoders to be stripped down to the bare essentials for
implementation in low-cost hardware.
Main (MP)
Most of the consumer-oriented work is done with this profile.
4:2:2 (422P)
This is being standardized by SMPTE for use in studio situations.
SNR
Separate base and enhancement layers provide a moderate-quality
base signal and a low noise output when both are combined.
Transmitters modulate the two signals at different power levels
to gain a further reach for the base signal. Fringe reception areas
will see the base signal but may not be able to pick up the
enhancement layer because the signal level will be too weak.
Spatial (SPT)
Spatial transformations deliver base and enhancement layers at
two resolutions.
High (HP)
Spatial transformations deliver base and enhancement layers at
two resolutions but at higher bandwidths.
Multi-view (MVP)
A special coding mechanism for stereoscopic film; it has two
separate streams, one for each eye.
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